underwear
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underwear
Clothing worn directly on the skin under normal clothes, such as underpants, briefs, bras, or undershirts.
Ich muss noch neue Unterwäsche für den Urlaub kaufen.
I still need to buy new underwear for the vacation.
The word is made up of 'unter' (under) and 'Wäsche' (laundry/clothing). So it literally refers to the 'Wäsche' that you wear under normal clothes.
Er packte Socken, T-Shirts und Unterwäsche in seinen Koffer.
He packed socks, T-shirts, and underwear in his suitcase.
'Unterwäsche' (underwear) is a collective term and is almost always used in the singular, even when talking about several items. If you mean a single garment, you say 'ein Stück Unterwäsche' (a piece/item of underwear).
Meine ganze Unterwäsche ist in der Waschmaschine.
All my underwear is in the washing machine.
Common verbs used with 'Unterwäsche' (underwear) are 'tragen' (to wear), 'anhaben' (to have on), 'wechseln' (to change), and 'waschen' (to wash).
Nach dem Sport sollte man seine Unterwäsche wechseln.
After exercising, you should change your underwear.
laundry
'die Wäsche' and 'die Unterwäsche' both belong to the area of clothing and washing. 'die Wäsche' is a general word for clothing, towels, or bedding that is dirty, in the washing machine, or already clean. In some contexts, 'Wäsche' can also mean underwear, but that is less precise. 'die Unterwäsche' means only the items of clothing that you wear directly on your skin under your normal clothes. The words can be confused because underwear can also be part of the laundry. If you are talking about everything that is washed, use 'Wäsche'. If you mean briefs, underpants, or bras, 'Unterwäsche' is more precise.
Jonas packt für die Reise frische Unterwäsche in den Koffer.
Jonas packs fresh underwear in his suitcase for the trip.
Nach dem Urlaub hat sich zu Hause viel Wäsche gesammelt.
After the vacation, a lot of laundry had piled up at home.